My first go to for walls is local art but I also love unexpected items on the wall. I think it would be great in a kids room as well as a clean changeable pop of color in a bedroom.
I am in the beginning stages of building a bathroom downstairs. I ran across this picture and I could not resist the urge to post it. It might just change my course.
Look for more posts about the bathroom progress!!!! I am doing it all by myself so it is going to be a slow process but it should be interesting learning to drywall and install all of the fixtures.